Effects of fluid inertia and surface tension parameter on the operating characteristics of a cylinder‐plane bearing
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Abstract The hydrodynamic characteristics of a cylinder‐plane bearing are investigated by using a modified Reynolds equation. The modified Coyne‐Elrod boundary conditions are used at the rupture boundary. It is found that the pressure in the convergent portion of the bearing, and hence the load capacity, is increased significantly as the Reynolds number is increased. The pressure distribution and the load capacity of the bearing are relatively insensitive to the variation of the surface tension parameter.Keywords:
Tension (geology)
Fluid bearing
Lubrication theory
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In this chapter we discuss the reduction of surface and interfacial tension by surfactants. We consider the efficiency and effectiveness in surface tension reduction, liquid–liquid interfacial tension reduction, and dynamic surface tension reduction.
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Even though a company is willing to adopt an information system, there is often some organizational inertia associated with the adoption process. In this paper, we explore the types of inertia in IS adoption in the context of a specific business process. Drawing on seven case studies where inertia can be observed, we illustrate the inertia types found in earlier research and find indication for the existence of two new types of inertia: externality inertia and mimetic inertia.
Externality
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Abstract Surface texturing is becoming an effective way for increasing the performance of hydrodynamic bearings. However, introducing the texture on the lubricated sliding contact may lead to the presence of the inertia effect as well as the cavitation effect. In this study, the correlation between the inertia and the cavitation in textured bearing is investigated in terms of hydrodynamic pressure and load support. The Navier-Stokes equation based on CFD and modified Reynolds equation are applied. In addition, the use of slip condition and its effect on the performance of bearing is of particular interest. The simulations are conducted in very low sliding velocity to address the low inertia effect. The result shows that increasing inertia effect can increase the load support, but the cavitation effects is not found in the bearing pattern in which the inertia is not significant. The other interesting result concludes that slip reduces the load support, but on the other hand slip also increases the load support depending on the texture length.
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Added mass
Moment of inertia
Dynamics
Fluid bearing
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The modified Reynolds equation in conjunction with the modified Coyne-Elrod rupture model is used to investigate the inertia effect on the pressure distribution in converging-diverging bearings. The modified Reynolds equation is solved analytically for infinitely long bearings, including the cylinder-plane bearing and the journal bearing. The results showed that the fluid inertia tends to stretch the fluid film and to move the film rupture point farther downstream. The effects are profound even at a moderate value of the reduced Reynolds number, Re* ≈ 0.13 based on the minimum film thickness.
Lubrication theory
Fluid bearing
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Moment of inertia
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Tension (geology)
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The conventional analyses based on the classical Reynolds equation are incomplete to get five predictions of the dynamic characteristics of externally pressurized gas bearings. This seems to be attributed to the fact that the Reynolds equation ignores entirely the inertia forces of the gas-film. This paper process modified Reynolds equations, which are derived by averaging out the inertia forces in Navier-Stokes equations across the film thickness, and their adequate boundary conditions, in order to determine the influence of the inertia forces on the dynamic characteristics such as the whirl instability and the squeeze damping.
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